Google Play Books, an app that comes pre-installed with stock Android, has now become the 9th app to cross the 1 billion install mark. 1 billion is an enormous number. It comes with 9 zeroes. 9. It is the amount Facebook paid for Instagram, and now, it is how many occasions Play Books has appeared on an Android device. It isn’t exactly an incredible achievement considering it ships with most Android phones, however, it is a big number nonetheless.

Play Books is simply the 9th app to achieve this bar, only 2 non-Google apps, WhatsApp, and Facebook have ever passed this milestone. As you might expect, some of the more well-liked Google-made apps like Google Maps and Gmail passed 1 billion at various times over the past couple of years.